Based on the info in your signature, and assuming you plan on keeping this system up for at least 2 or more years, a calcium reactor is the correct choice. The stability provided by a quality reactor is worth every penny - and you can leave the tank for almost any period of time without an appreciable change in DHK or Ca.

Yep I have a CA reactor lined up already just need to find a reg. w/solenoid anyone know a good place to get/order one.

http://www.bulkreefsupply.com/Calciu...duct_info.html
This is the one that I bought haven't had any problems.

well i have a 150 SPS dominate reef and i still only drip Kalk from my stirrer and do 5 gal per week. my levels are still excellent until the day comes to get a doser i have had many ALK reactors in my time i hate them you never get the proper dosing and too many drips here to many ML there not enough bubbles here.

I like the Kalk way for now ,